Portable hoist



Aug. 2, 1966 c. E. WElNMAN PORTABLE HOIST Filed Jan. 14, 1965 FIG. 4

FIG. 3

RN OA WW 1.... M a m .2 W WW m ATTORNEYS United States Patent 3,263,822 PORTABLE HOIST Carl E. Weinman, Lake City, Minn., assignor to Valley Craft Products, Inc, Lake City, Minn., a corporation of Minnesota Filed Jan. 14, 1965, Ser. No. 425,480 3 Claims. (Cl. 212145) The herein disclosed invention relates to hoists and particularly to a hoist having an elongated base with a mast carrying a boom located at the rear end of the base and with floor supporting means at both the front and rear ends of the base, the supporting means at the rear end of the base being disposed closer to the mast than the supporting means at the front end of the base.

An object of the invention resides in providing guide means for guiding the floor supporting means for the rear end of the base for movement to increase the distance between said supporting means and the mast.

Another object of the invention resides in providing a beam carrying the rear floor supporting means and a guide carried by the rear end of the base and supporting the beam for transverse movement relative to the frame to increase the distance between the rear floor supporting means and the mast.

A still further object of the invention resides in providing means for restraining rotation between said beam and guide.

Other objects of the invention reside in the novel combination and arrangement of parts and in the details of construction hereinafter illustrated and/or described.

In the drawings:

FIG. 1 is a plan view of a hoist illustrating an embodiment of the invention applied thereto.

FIG. 2 is an elevational view of the structure shown in FIG. 1.

FIG. 3 is a view similar to FIG. 1 with the parts in altered position.

FIG. 4 is a fragmentary sectional view taken on line 44 of FIG. 1 and drawn to a greater scale.

The hoist illustrated comprises a base constructed of tubular metal bent into the form of a U and having spaced side members 11 and 12 and a connecting portion 13 therebetween. The extreme forward ends 14 and 15 0f the side members 11 and 12 constitute the forward end of the frame and the connecting portion 13 constitutes the read end of the frame. Welded to the connecting portion 13 and to the rear ends 17 and 18 of the side members 11 and 12 is a platform 16. Below the front ends 14 and 15 and the rear ends 17 and 18 of side members 11 and 12 are welded plates 21. Bolted to these plates are front caster wheels 22 and rear caste-r wheels 23 which rest on the floor and by means of which the hoist is movably supported.

On the platform 16 is mounted a vertical bearing 24 having a flange 25 encircling the upper portion of this hearing. The lower end of a tubular mast 26 is journalled in this hearing and has a flange 31 welded on it which rests on the flange 25. The upper end of the mast 26 has secured to it a forked fitting 32 which receives another fitting 33 mounted on the inner end of a boom 34. A journal 35 passes through both of these fittings and supports the boom for swinging movement in an up and down direction as indicated in FIG. 2 in full and dotted 3,263,822 Patented August 2, 196.6

lines. A boom extension 36 is slidably mounted in the boom 34 and is held in adjusted position by means of a pin 37 adapted to extend through said boom and through any of a number of holes 38 in said extension. At the end of the boom 34 is a fitting 39 and to which suitable hoisting tackle not shown may be attached.

The boom 34 may be raised by means of a pistoncylinder combination 43 of common construction and of which the case 44 and piston rod 45 are shown in FIG. 2. The case 44 is pivoted to a bearing 46 welded to mast 26 and flange 31. The piston rod 45 is similarly pivoted to any of a number of bearings 47 welded to the boom 34 and boom extension 36 by means of a removable pintle 48.

Attached to the connecting portion 13 of frame 10 by welding is a square tubular hollow box-like guide 51 best shown in FIG. 4 and having a square hole 52 therethrough. Slidably mounted in this hole is a square tubular beam 53. This beam extends outwardly beyond said guide on each side thereof.

To hold the beam 53 in adjusted position, a boss 57 is welded to the guide 51 and tapped to receive a set screw 58 which is adapted to engage the beam 53.

Mounted on the ends of the beam 53 are box-like sliders 59 which have welded to the undersides thereof plates 54. Caster wheels 55 are bolted to said plates. Set screws 56 similar to the set screw 58 hold the sliders 59 in position.

To aid in moving the hoist about, a handle 61 is pro vided which is bent from round rod. This handle has a journal 62 journalled in a bearing 63 secured to the platform 16 and to the bearing 24. This journal has shanks 64 extending upwardly therefrom and which terminate in outwardly extending hand grips 65. A clip 66 secured to flange 25 holds the handle in vertical position when not in use.

For operating the piston-cylinder 43, an oil pump, motor and storage battery not shown are mounted in a box 67 secured to plat-form 16 which is shown in FIG. 2 but has been omitted from the other views for the sake of clarity. A control 71 operated by a handle 72 serves to cause raising and lowering of the boom 34.

The method of using the invention is as follows: The entire hoist is wheeled about by means of the handle 61 to the desired locality and the front headed toward the load. The handle 61 is then moved back to be engaged by the clip 66 and so held out of the Way. The mast is nowmanu-ally rotated by pulling on the boom extension 36 and rotated to a position over the load. The load is then attached to the boom extension 36 by the tackle employed for the purpose. Control 71 is now operated by lever 72 to cause oil to be pumped into the cylinder 44 and the boom 34 raised to lift the load off the floor. If the load is to be deposited at about the same locality relative to the frame as it was when picked up, no alteration of the position of the auxiliary supporting structure is necessary. If the load is to be deposited directly to the right or left of frame 10, the beam 53 before the load is picked up is moved in a direction toward the load until the wheel 55 at the desired side of the hoist is as close to being under the load as possible and then locked in position by set screw 58. The hoise is then moved to the site of the load, picked up and wheeled to the site of deposit. At such locality the load is shifted from its pick up position to its deposit position by rotating mast 26. The load may now be deposited where required. By moving the beam as described the hoist is prevented from toppling over when the supporting wheels on the beam are in their innermost positions. Where the load is in the open, the same may be straddled by the sides 11 and 12 of the base and the boom extension placed directly over the load. If desired, the beam 53 may be removed by removing one or both of the sliders 59.

The advantages of the invention are manifest. Danger of overturning of the hoist is greatly reduced. Heavier loads can be handled. The boom can be reached out further and the load handled from the side of the hoist as well as from the rear.

Changes in the specific form of the invention, as herein described, may be made within the scope of what is claimed without departing from the spirit of the invention.

Having described the invention, what is claimed as new and desired to be protected by Letters Patent is:

1. In a hoist comprising a base, floor engaging means for supporting said base, a boom, supporting means for the boom carried by the base and disposed toward one end thereof, means for guiding said boom fior rotation about a substantially vertical axis, means for raising and lowering said boom, the combination of:

(a) a guide extending transversely of said frame and free at both ends, said guide being (b) disposed at the end of the base at which the boom is located,

(c) a single beam longer than the guide and slideable along the guide,

((1) said beam having end portions at each end extending outward-1y beyond the end said guide and (e) separate floor engaging means attached to the beam at end portions of the beam,

(f) one of said floor engaging means moving toward the frame when the other moves away from the .frame and vice versa.

2. The combination recited in claim 1 wherein the guide is of lesser length than the width of the frame to allow greater extension of the supporting means beyond the frame.

3. The combination recited in claim 1 in which the guide is tubular and is open at both ends.

References Cited by the Examiner UNITED STATES PATENTS 2,699,875 1/1955 Stratton 212 2,804,979 9/1957 Lassiter 212 X 2,828,868 4/1958 Odoran 212145 2,957,592 10/1960 Thacker 212145 3,059,785 10/1962 Buckeye 212 35 X HUGO O. SCHULZ, Primary Examiner. 

1. IN A HOIST COMPRISING A BASE, FLOOR ENGAGING MEANS FOR SUPPORTING SAID BASE, A BOOM, SUPPORTING MEANS FOR THE BOOM CARRIED BY THE BASE AND DISPOSED TOWARD ONE END THEREOF, MEANS FOR GUIDING SAID BOOM FOR ROTATION ABOUT A SUBSTANTIALLY VERTICAL AXIS, MEANS FOR RAISING AND LOWERING SAID BOOM, THE COMBINATION OF: (A) A GUIDE EXTENDING TRANSVERSELY OF SAID FRAME AND FREE AT BOTH ENDS, SAID GUIDE BEING (B) DISPOSED AT THE END OF THE BASE AT WHICH THE BOOM IS LOCATED, (C) A SINGLE BEAM LONGER THAN THE GUIDE AND SLIDEABLE ALONG THE GUIDE, (D) SAID BEAM HAVING END PORTIONS AT EACH END EXTENDING OUTWARDLY BEYOND THE END SAID GUIDE AND 